Greg McClintock is a character portrayed by Michael Cassidy in the ABC crime series Castle. Greg is everything Castle wants in a nurse - except male. He materializes ten minutes into "Anatomy of a Murder", and proceeds to demonstrate the gravitational forces of what Ryan later labels the "Galaxy of Greg". Every lady working in the hospital, with the apparent exception of Dr. Valerie Monroe, sees Greg as her "special friend", although, from what Beckett and Castle can piece together, there's no sex involved. Greg is just very good at making ladies feel special, and even Kate gets caught up, for just a moment, in his radiant charm. Greg's constant endeavors, however, have a very serious purpose - and a highly illegal one. His girlfriend, Amy Porter, is a prisoner upstate, but the hospital wh